That's an excellent and very practical question! The short answer is: most garden benches do come with the necessary hardware to put them together, but the completeness and quality can vary dramatically.
Typically, when you purchase a flat-pack or ready-to-assemble (RTA) garden bench—the kind delivered in a box—it will include a hardware kit. This kit usually contains bolts, nuts, washers, screws, and sometimes wooden dowels or cam locks. Crucially, it should also include the right Allen keys or wrenches needed for the job. Always check the product description or "What's Included" section before buying; it should list the hardware.
However, there are important caveats. The provided hardware is often basic. For a bench that will endure weather and weight, you might consider upgrading. Using stainless steel or galvanized hardware instead of the included standard steel parts will massively improve rust resistance and longevity.
You will almost always need to supply your own tools. While specialty tools like Allen keys are sometimes included, you'll need basics like a screwdriver, hammer, and adjustable wrench. A power drill/driver is highly recommended to save time and effort.
Pro Tips for Assembly:
1. Inventory First: Lay out all parts and hardware against the manual's checklist before starting.
2. Don't Overtighten: Especially with wooden benches, overtightening bolts can split the wood. Snug is enough.
3. Work on a Soft Surface: Assemble on grass or a blanket to prevent scratching the finish.
4. Consider Sealant: For wooden benches, applying a sealant to pre-drilled holes before inserting screws can protect against moisture.
In summary, yes, the hardware is usually in the box. Your role is to have the common tools ready, follow the instructions patiently, and consider investing in better hardware for a bench built to last for years in your garden.